Sensitivity enhanced SeNPs-FTO electrochemical sensor for hydrogen peroxide detection

Abstract

Selenium nanoparticle (SeNPs) was synthesized by the chemical reduction method. A novel electrochemical sensor based on selenium nanoparticles coated on fluorine-doped tin oxide glass substrate (SeNPs-FTO) was developed by using a spin coating method for the hydrogen peroxide detection. DLS analysis of synthesized SeNPs showed an average particle size of 94.4 nm, 47.8 nm, and 57.0 nm for 1:1, 1:5, and 1:10 of the ratio of sodium borohydride and gallic acid (SB: GA) respectively. HRTEM analysis of synthesized SeNPs (SB: GA = 1:5) showed nanorods in shape with the particle size from 30 to 80 nm. The presence of selenium in nanorods confirmed by EDAX. FTIR analysis confirmed the presence of hydroxyl (-OH), alkyl (C H), and carboxyl (-C=O) functional groups on the surface of SeNPs. The electrochemical study of SeNPs-FTO was performed with the help of cyclic voltammetry and amperometry. The synthesized SeNPs-FTO based sensor demonstrated sensitivity for H 2 O 2 sensing ~104.2 μAmM −1 cm −2 (R 2 = 0.9927) in the linear detection range of 0.1 to 20 mM with a low detection limit of 0.0793 mM and the detection response time of 0.5 s. The SeNPs-FTO showed a higher selectivity towards H 2 O 2 detection confirmed by using interfering species such as ascorbic acid, sucrose, urea, sodium chloride, and glucose. • SeNPs-FTO electrode as novel non-enzymatic electrochemical sensor. • SeNPs-FTO sensor prepared by using a spin coating and hydrothermal technique. • SeNPs-FTO used as an electrode for H 2 O 2 detection. • SeNPs-FTO sensor demonstrated higher selectivity and sensitivity detection of H 2 O 2 . • SeNPs-FTO electrode shows excellent catalytic activity of H 2 O 2 reduction.